Tuesday, August 11, 2009
Indian Ocean Tsunami Warning Cancelled
The Pacific Tsunami Warning Center (PTWC) issued a warning for the Indian Ocean at 2005 UTC (bulletin number 1). This followed a 7.7 earthquake near the Andaman Islands. A tsunami was predicted to arrive in towns in the islands within 15 minutes, and on the Indian mainland including KAKINADA within an hour, and later: MYANMAR, INDONESIA, THAILAND, BANGLADESH. The JAPAN METEOROLOGICAL AGENCY (JMA) issued a similar bulletin at 2025. The PTWC issued a second bulletin at 2105Z saying a tsunami was generated, but a third bulletin at 2124Z corrected this saying no tsunami had been observed. At 2211Z PTWC cancelled the Tsunami watch. A problem with this process is the difference in times and details between the Japanese and US warnings. The JMA seems to issue fewer, later and less detailed bulletins.